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Note Goodwill and other intangible assets (Carrying amount of goodwill by reportable segments) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Goodwill [Line Items]          
Beginning Balance   $ 626,388   $ 626,388 $ 465,676
Goodwill on acquisition       0 42,634
Purchase accounting adjustments   4,700   4,707 (3,385)
Goodwill impairment charge       (3,801) 0
Ending Balance $ 627,294   $ 504,925 627,294 504,925
Continuing Operations          
Goodwill [Line Items]          
Goodwill impairment charge (3,801)   0 (3,801) 0
Banco Popular de Puerto Rico          
Goodwill [Line Items]          
Beginning Balance   280,221   280,221 250,109
Goodwill on acquisition       0 3,899
Purchase accounting adjustments       0 (3,385)
Goodwill impairment charge       (3,801) 0
Ending Balance 276,420   250,623 276,420 250,623
Banco Popular North America          
Goodwill [Line Items]          
Beginning Balance   $ 346,167   346,167 215,567
Goodwill on acquisition       0 38,735
Purchase accounting adjustments       4,707 0
Goodwill impairment charge       0 0
Ending Balance $ 350,874   $ 254,302 $ 350,874 $ 254,302